The new v. old argument will run for ever
You can buy a heck of a lot of fuel and maintenance on a 1.5 mill Kingair comapered to a 5 mill PC12
3.5 Mill on fuel and extra maintenance? should soon cover the other engine.
Being serious Yes if you buy new and stay with the same aircraft the depreciation should even out a bit but then after those ten years you will probably be faced with rebuilding a turbine and having a more maintenance older aircraft.
The higher you are the further you have to fall. Not sure a TB20 new over 10 years would follow the same pattern as a PC12 at $5 Mill
Manufatcurers will make figures read what they want to get new sales
Pace